ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIROMKCYAL..............................JDIM350 (Ver 2.1 Jan 2001) 1990980/0 1620000/01063525EUROPEAN PATENT APPLICATIONA320031217EP99202501.519990729EnEnEn9920176619990604EP20031217200351200012272000527 7G 01N 33/22 A 7G 01N 33/28 B 7G 01N 25/00 B 7G 01N 29/02 BdeVerfahren zum Messen der in einem Brenngas anwesenden WärmemengeenMethod for measuring the quantity of heat present in fuel gasfrMéthode de mesure de la quantité de chaleur présente dans un gaz combustible3N.V. NEDERLANDSE GASUNIE002095023708EP/II/NEDERLANDSE GASUNIE, N.V.GASUNIE, N.V. NEDERLANDSEConcourslaan 17NL-9727 KC GroningenNLRUHRGAS AKTIENGESELLSCHAFT002394913708EP/II/Huttropstrasse 6045138 EssenDEvan Wesenbeeck, Petrus Johanna Marinus MariaKremersheerd 309737 PA GroningenNLJaeschke, ManfredBarkenberger Allee 19246286 DorstenDESchouten, Johannes AdrianusJohan Buyeslaan 241141 GT MonnickendamNLKrijgsman, Willemet al00074971DSM Patents & Trademarks Geleen Office P.O. Box 96160 MA GeleenNLATBECHCYDEDKESFIFRGBGRIEITLILUMCNLPTSEALLTLVMKROSI20031217200351

Method for measuring and/or regulating a quantity of heat contained in a fuel gas, the calorific value of the fuel gas being used as an input parameter, in which method

a) the fuel gas or a part-stream of the fuel gas is guided through a volumetric meter or a mass flow meter, and the volumetric flow rate or the mass flow rate is measured,
b) the speed of sound of the gas is determined under first reference conditions,
c) one of the measurement variables dielectric constant, speed of sound under second reference conditions, carbon dioxide content of the fuel gas, nitrogen content of the fuel gas or density under standardised conditions is recorded; and
d) the quantity of heat supplied is derived from these parameters, together with the calorific value of the fuel gas, as a measurement variable or control variable.